Mumford & Sons bassist Ted Dwane was taken to the hospital Monday to have emergency surgery on a blood clot on the surface of his brain, leading the folk-rock band to postpone three sold-out concerts this week.

The band is rescheduling dates in Texas, Dallas (6/11) and The Woodlands (6/12), as well as a show in New Orleans (6/13). Tickets for those shows will be honored on the new dates, which should be announced soon, Mumford & Sons said in a statement on its website. The band said it did not anticipate having to cancel or postpone any other dates.